SA.42799(2015/X) The object of the project is the purchase of external advisory services consisting of carrying out a professional design process in order to develop original design projects and implement new products on the market in the form of three base enclosures with widths of 1, 2 and 4 times the width of the basic DIN module together with three assembly bases. The development will be 3 base housings (3 design designs) with widths of 1, 2 and 4 times the basic DIN module width (the width of the DIN basic module is 17.5 mm) and 3 backplane bases of the same width that can be combined permanently with a compact modular base with the desired width, covering the desired number of modules. Each of the 3 base housings will consist of two parts: the lower and the upper, which, after the connection, form a closed space containing the electronic resources of the module. These enclosures will be mounted to the mounting base using a latch or bolt, and the whole will be mounted on the DIN rail also with a latch or a bolt. The bases will be provided by a connector system, providing the signals of the communication interface used by the central unit to communicate with other modules and possibly power supply. This method of installation is intended to allow easy removal of one of the modules from the base, without the need to remove the base from the DIN bus. Interconnection of modules: the central unit will be in the middle, the I/O modules will be on its right, and the intelligent modules on its left.